Can you go through grocery stocks and plan so that you're minimising grocery shop to essentials only
Cancel any non essential subscriptions, any direct debits due to come out before you're straight again some you can move the dates to give you a bit of breathing space I used to do that at times
Use loyalty points - using them to buy stuff is usually the least efficient way to use them but as a temporary measure may help. If you can time it right (check with providers) you can maybe use points to offset other bills - eg Clubcard points can be used towards Tesco mobile bill I did this last month, forgot to do it this month but I'm gonna do it again ASAP so it'll bring next months bill down
Money saving expert site is excellent for this kind of advice but also there's the credit club - which if you join (doesn't cost) can tell you which credit cards you might be able to get even with bad credit. I did this a few years back and have used it initially for a similarly tight short term issue and then when that was cleared I've rebuilt my credit rating and it's now excellent again
There are credit cards that people with poor credit can get
@BunnyRuddington credit unions you tend to have to have a history with them before you can borrow now
@SorrySoldOut there have been issues on mn in the past where posters have basically posted begging threads and well meaning posters have been scammed - absolutely not saying that applies to op but its standard for mn to post that warning on this kind of thread now
Hope you get through next few days ok op, I've been there too, with like pennies in my account and praying nobody takes a flipping direct debit out early! (Which happens!) it sucks!